Carbon, Hydrogen, Nitrogen, Sulfur (CHNS) Analyzer
AMI uses a ThermoScientific FlashSMART CHNS/O analyzer.
The sample is weighed into a tin container and dropped into the combustion reactor, where oxygen gas is flowing. Because the tin comes into contact with a strong oxidizing environment, a strong exothermic reaction is triggered. The temperature rises to around 1800°C causing sample combustion. The combustion products are conveyed across the reactor, where nitrogen oxides and sulfur trioxide are reduced to elemental nitrogen and sulfur dioxide. The mixture of gases (N2, CO2, H2O, and SO2) flow into the chromatographic column where separation takes place. A chromatograph is collected and the peaks are integrated and compared with a calibration standard to determine the percentages (or concentration) of nitrogen, carbon, hydrogen, and sulfur contained in the sample.
Typical methods include:
- ASTM D5737
- ASTM D3176
